package com.lowca.news.web.controller.admin;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import static com.lowca.news.constant.Constants.ARTICLE_IMG_REAL_PATH;
import static com.lowca.news.constant.Constants.ARTICLE_IMG_PATH;

@Controller
public class KindEditorController {

	private Log log = LogFactory.getLog(KindEditorController.class);

	@RequestMapping(value = "/admin/kindeditor/file-upload.do", method = RequestMethod.POST)
	@ResponseBody
	public Map<String, Object> fileUpload(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException,
			FileUploadException {
		ServletContext application = request.getSession().getServletContext();
		String savePath = application.getRealPath(ARTICLE_IMG_REAL_PATH);

		// 文件保存目录URL
		String saveUrl = request.getContextPath() + ARTICLE_IMG_PATH;

		// 定义允许上传的文件扩展名
		HashMap<String, String> extMap = new HashMap<String, String>();
		extMap.put("image", "gif,jpg,jpeg,png,bmp");
		extMap.put("flash", "swf,flv");
		extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
		extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

		// 最大文件大小
		long maxSize = 1000000;

		response.setContentType("text/html; charset=UTF-8");

		if (!ServletFileUpload.isMultipartContent(request)) {
			return getError("请选择文件。");
		}
		// 检查目录
		File uploadDir = new File(savePath);
		if (!uploadDir.isDirectory()) {
			return getError("上传目录不存在。" + savePath);
		}
		// 检查目录写权限
		if (!uploadDir.canWrite()) {
			return getError("上传目录没有写权限。");
		}
		String dirName = request.getParameter("dir");
		if (dirName == null) {
			dirName = "image";
		}
		if (!extMap.containsKey(dirName)) {
			return getError("目录名不正确。");
		}
		// 按日期建立子文件夹
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
		String ymd = sdf.format(new Date());
		savePath += ("/" + ymd + "/");
		saveUrl += ("/" + ymd + "/");
		// 如果子文件夹还未创建，创建文件夹
		File dirFile = new File(savePath);
		if (!dirFile.exists()) {
			dirFile.mkdirs();
		}
		FileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setHeaderEncoding("UTF-8");
		List items = upload.parseRequest(request);
		Iterator itr = items.iterator();
		while (itr.hasNext()) {
			FileItem item = (FileItem) itr.next();
			String fileName = item.getName();
			if (!item.isFormField()) {
				// 检查文件名称
				int p = -1;
				if (fileName == null || (p = fileName.indexOf(".")) <= 0
						|| p == fileName.length() - 1) {
					return getError("文件名不正确");
				}
				// 检查文件大小
				if (item.getSize() > maxSize) {
					return getError("上传文件大小超过限制。");
				}
				// 检查扩展名
				String fileExt = fileName.substring(p + 1).toLowerCase();
				if (!Arrays.<String> asList(extMap.get(dirName).split(","))
						.contains(fileExt)) {
					return getError("上传文件扩展名是不允许的扩展名。\n只允许"
							+ extMap.get(dirName) + "格式。");
				}

				SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
				String newFileName = "attached_" + df.format(new Date()) + "_"
						+ new Random().nextInt(1000) + "." + fileExt;
				try {
					File uploadedFile = new File(savePath, newFileName);
					item.write(uploadedFile);
				} catch (Exception e) {
					return getError("上传文件失败。");
				}
				String fullUrl = saveUrl + newFileName;
				Map<String, Object> msg = new HashMap<String, Object>();
				msg.put("error", 0);
				msg.put("url", fullUrl);
				// 记录日志
				log.info("文件 " + fileName + " 上传成功，路径是 " + fullUrl);
				return msg;
			}
		}
		return null;
	}

	private Map<String, Object> getError(String message) {
		Map<String, Object> msg = new HashMap<String, Object>();
		msg.put("error", 1);
		msg.put("message", message);
		return msg;
	}

}
